Raze.bot Developers

POST /bundle

Simple REST endpoint for submitting a Jito-compatible bundle. Alternative to the JSON-RPC sendBundle method — same logic, simpler request format. If your bundle does not include a Jito tip transaction, the relay automatically sponsors one and appends it.

Servers

Region	Endpoint
Frankfurt	`https://fra.send.raze.sh/bundle`
Amsterdam	`https://ams.send.raze.sh/bundle`
Chicago	`https://chi.send.raze.sh/bundle`
Singapore	`https://sg.send.raze.sh/bundle`

Request

POST /bundle
Content-Type: application/json

{
  "transactions": [
    "<encoded_tx_1>",
    "<encoded_tx_2>"
  ],
  "encoding": "base58"
}

Field	Type	Required	Default	Description
`transactions`	string[]	Yes	—	Array of signed transactions (1–5)
`encoding`	string	No	`"base58"`	`"base58"` (Jito-compatible) or `"base64"`

Bundle constraints

Max 5 transactions if your bundle already includes a Jito tip
Max 4 transactions if no Jito tip — relay appends its own tip as the 5th
At least 1 transaction required

Response

Success:

{
  "success": true,
  "bundle_id": "4xTWpZFcQh8mK3nRJjz3wXBoRgixCa6xjnB7YaB1pPB263..."
}

Error:

{
  "success": false,
  "error": "bundle must contain at least 1 transaction"
}

HTTP Status	Meaning
`200`	Bundle submitted (check `success` field — Jito may still reject)
`400`	Invalid request (decode failure, too many txs, empty bundle)
`502`	Jito Block Engine unreachable
`503`	Bundle sending not configured or blockhash not ready

Code examples

curl
Node.js
Python
Rust

curl -X POST https://fra.send.raze.sh/bundle \
  -H "Content-Type: application/json" \
  -d '{
    "transactions": ["<base58_tx_1>", "<base58_tx_2>"],
    "encoding": "base58"
  }'

const response = await fetch("https://fra.send.raze.sh/bundle", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    transactions: [base58Tx1, base58Tx2],
    encoding: "base58",
  }),
});

const data = await response.json();
if (!data.success) throw new Error(data.error);
console.log("Bundle ID:", data.bundle_id);

import requests

resp = requests.post("https://fra.send.raze.sh/bundle", json={
    "transactions": [base58_tx1, base58_tx2],
    "encoding": "base58",
})

data = resp.json()
if not data["success"]:
    raise Exception(data["error"])
print("Bundle ID:", data["bundle_id"])

let client = reqwest::Client::new();
let resp = client
    .post("https://fra.send.raze.sh/bundle")
    .json(&serde_json::json!({
        "transactions": [base58_tx1, base58_tx2],
        "encoding": "base58"
    }))
    .send()
    .await?;

let data: serde_json::Value = resp.json().await?;
println!("Bundle ID: {}", data["bundle_id"]);

Protocols

REST

JSON-RPC

​POST /bundle

​Servers

​Request

​Bundle constraints

​Response

​Code examples